If you know the primary mission of JSTARS, and the main mission of Ft. Hood, the answer as to what they're doing is somewhat obvious.
As for freqs, other than ATC type stuff, they'll probably be tactical ones, & probably be secure. The circuit to the Ground Station Modules are secure datalinks. But they also do an airborne battlefield command & control mission these days & that might be your best bet for catching them in non-secure mode.
You should check 30-87.975MHz FM (30kHz deviation) in 25kHz steps, 118-144MHz AM, 148-150.60 AM, 225-400MHz AM.
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